Support compressed debug in dyn objects.

Support compressed debug in dyn objects.

2015-02-09  Cary Coutant  <ccoutant@google.com>

gold/
	* dwp.cc (Sized_relobj_dwo::do_decompressed_section_contents): Delete.
	(Sized_relobj_dwo::setup): Setup map of compressed sections.
	(print_version): Update copyright.
	* dynobj.cc (Sized_dynobj::base_read_symbols): Set up map of compressed
	sections.
	* object.cc (Sized_relobj_file::compressed_sections): Delete.
	(build_compressed_section_map): Add decompress_if_needed parameter.
	Adjust callers.
	(Sized_relobj_file::do_find_special_sections): Set compressed sections
	map in Object base class.
	(Sized_relobj_file::do_decompressed_section_contents): Rename to
	Object::decompressed_section_contents.
	(Sized_relobj_file::do_discard_decompressed_sections): Rename to
	Object::discard_decompressed_sections.
	* object.h (Object::compressed_sections_): New data member.
	(Object::section_is_compressed): Remove virtual, implement here.
	(Object::decompressed_section_contents): Remove virtual.
	(Object::do_section_is_compressed): Delete.
	(Object::do_decompressed_section_contents): Delete.
	(Object::set_compressed_sections): New method.
	(Object::compressed_sections): New method.
	(Sized_relobj_file::do_section_is_compressed): Delete.
	(Sized_relobj_file::do_decompressed_section_contents): Delete.
	(Sized_relobj_file::do_discard_decompressed_sections): Delete.
	(Sized_relobj_file::compressed_sections): Delete.